We are missing a lot of method testing here. Use sinon mocks and stabs to control the external factor for each of the methods exposed in [iac_manager.js](https://github.com/mozilla-b2g/gaia/pull/19628/files#diff-b465cee79ebe546c0b2739719faf5db2R71) and test all of them.

Your alternative is to test only the public API (you missed `broadcastEndOfSMSQuery()`) then file a bug and complete the testing.